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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd16bfde3c442daf9f1f23a91b083ecb894ee9ea009c4f84e6ea2541066e32f' 
  AND token = 'yfScfuQ308N0W5FUvYcEDrPEqWJ9O5fbrNEINaIWAvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}